disp: msm: sde: remove sde wrapper for clock set flags

Since clock set flags api is deprecated for new target, this
change removes sde wrapper and removes LUT memeory retention logic
from crtc module.

Change-Id: If37ec780913668c1a43f8a71e79249679526bd34
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>